.rank {
  width: 1200px;
  margin: 0 auto;
  overflow: hidden;
  .leftSider {
    width: 280px;
    float: left;
  }
  .content {
    width: 900px;
    background-color: white;
    float: left;
    margin-top: 20px;
    margin-left: 20px;
  }
}
